moody



April 12, 1932.

L. F. MQODY' DRAFT TUBE Filed Feb. 28, 1928 5 Sheets-Sheet 1 INVENTOR LEWIS F. MccoY L. F. MOODY DRAFT TUBE April 12, 1932.

5 Sheets-Sheet 2 Filed Feb. 28. 1.92s

INVENTOR Laws F Moopv April 12, 1932. MOODY 7 1,853,138

' DRAFT TUBE Y 1 Filed Feb. 28, 1928 5 Sheets-Sheet 3 INVENTOR Lewag F. Meow April 12, 1932.

L. F. MOODY 1,853,138

DRAFT TUBE Filed Feb. 28, 1928 5 Sheets-Sheet 4 INVENTOR Lawas F Monv L. F. MOODY DRAFT TUBE A rii 12, 1932.

set 5 Filed Feb. 28, 1928 5 Sheets- Sh Tusgm o1: mA-AT To? pr:

D\ STANCE 5; I wall in this. forth is {substantially verti'eal albzig its entire *len 'gth I sol ne'what as SHOWD- t pa ssage 34: preferably l retains: all of those y ehara'cteristiCQfind: s

:a'nd 'the various 'sectibins theieof;

In vthe Fig. 111 modification "the" upstream f-VVZIH 32" is e1imin1ted gnd a *straight upper @1 85 provided, the draftitubeconstruction every dtheriwzty remaining'asimilap'to that J from jthe I ehtrance passages' 3 6iiwill meet and 1 merge; approximately a tf 'the Center Of the lower runners 4:0 mndi 41. These" runr l fersfas isclose'dr ini'm'y tco'p'endmgfappheatmn;Sem-

yhieh this present: iapplieationftfoims axo'on- 4v tinuation-iin part, are" To fifdifierent {specific speed s.- ITheiifluidKrte;each -ru-hner is whirledi *1 '4 :by the usualjstay vanesio'rwicketfgates fziand l z 54 3, respectively T-he'disehargepassage-i44 ieur 'ves downwardlyiinsteadbf being straight, {I I was in the other forms sh0Wn, but -f the other 1 sehgmflctristics are sqmewhat thdsaminjthat, mesh qwn in Eig 14L; the entrance passages 45 j; j 1:";a119L46- zareflofisetiwithirespect to thecommon i T f trahsitiom'space .011passage47;.itbeing noted that the Walls of the tra-ns itionfspace arege11 l In xthe mule dificat'ibh 6f! Fig Lat , tjsibleiineverycdire'ctioltjseras:t be a e plete surface; Of revolut-len B X'QQPtQWhQI iscutiofi by -the intersecting .ilpst-rearm weill a of the -h 0 11 120111331 passage The upstream fof a--simple conical 'tube;equivalent to 1L hapesg'shown in Fig. 1'1

'tuid' di's'charges it in a radial olirecition' ,'thatt tub? andthe trahsit'iohi aikl bellebtor qinstahces may"nevertheless?'fllfwithinithe it I sco p the ther forms? ine'repfesentingfohe ide forms fo the draft tube herein de'scribedfl 580 f R being-noted:thatas 'thffluidfenters thebend, ,V t o'fithe t ube there is an inj r'easein the rate.

l'atterstages fof the behd thei'eis ai'de'crease; n'iwhich i fbllefid f in the dischar ge passage/Joya t-increase in the ratejofdeceleration. t I I' V :Itfshduld be coni dered thatfby" providing fin-efficient abllector passage; the size .of the nm-ary pcrti-omf the drafttube mztyfbe 9111; 3 h down'withdufiseriqus"lo'ssyfiQdrfit tub efii: hj v I .7 cienc hutwith material redurction inflth f overall dimensiona bf the "entire drift jlbe and Consequently of thegpb'werhouje and fs'lib g I Structure; 5 I j :1, v xvhile-the various forms'ofthe "invnti cjnv haxi beenhshown as ':app1ied"t0 tiltbiiie$ hai ing vertical shafts; iti'shbviousfthat with slight modifieation (if struwture' itg iis "ap as s hojwgl'iljthe prior forms. There has h'eri 'sh'own adizifttube and a spreadingcbll'ectorff 1 which receives "the flow, ir'i' ql fiaxial" di retlib n discharge; fdiiIGCtiQnfIlGt-id 11 v 't yia F g angle as" {the ore'ggiiiiig -kisr p idn 1? tinctien has been made betweenfthe primer sage, and anangularly disposed passage havl ing side walls and'anupstreain wall which, in horizontal section and'frorn a point adja- .cent to the upstream side-of said'entrance passage, curves in arelatively. gradual curve I toone of said sides, and .ina relatively i I Z QQQQJ said bell-mouth, the". pstream an (5i said angular passage having in horizontalsection 'a greater degree of curvature along one side; of its center line than on the other side there-f,

eretoland I y a sesses[Es V 15. A draft-tubehavin'g anentrance pas-q, i M

v-sage, and a passage disposedangularly tliere v 7 thereto and provided with an upstream wall, if so shaped thatlwhen'cut by aseries ofverti, calj parallelplanes each'section 3 so formed w I I cpile -.;a it, 4,. will-have the same degree of curvature asjall a other sections; a

f w lGQA'draft tube having anenirance pas sage, and-apassage disposed angularly theree to and provided with an 'upstreami-wall so a shaped that when out by series of-p'lanesf parallel. to each other and to thecentralaxes ofisaidjpassages each section soyformedwill j have the'samedegreeofcurvatureas all other p 7 sections; 17. A draft tube having "an entrance pas Sharper, curve to the other of saidsides.

- 1"l8.,,A draft tube havingan entrance pasf sage, and; an angularly disposed passage hava a I ing side walls and anupstreani wall which horizontal section curves, fromv a po nt adacent to the upstream side of sa dentrance passage, in a relatively gradual curve to one :of said sides,v and T in a; relatively, sharper I curve to tllOOtllQIOf said sides, said upstream;

' sage, and an angula'rly disposed PZI-SSagBPifO- walli loeing formed by radii disposed in par in planes parallel to said sides; ,v

20. A draft tube comprisingqan entrance, passage and an angularly "disposed passage 7 I allel planes. i

"19. A 'drafttube having entrance pas sagefandan angularly disposed passage hav- .ing sidewalls and anfupstreamfwall which in horizontal section curves, from a po nt ad- P ja'cent tothe upstream side of said entrance:

' passage, in a relatively gradual'curve' toone, of said'fsides, and in a relatively sharper curve tothe otheroi": said side's, said up stream wall" being formed. by radii Qdispo'sed having an upstream. wall formed by a series ofradi'i of identical length, the locus for the radiicente'rsibeing a line disposed in a horilupwardly toward the side of saidangular'p'assage most remote from the central axis of said entrance passage.

22. A draft tube having an entrance-pas-f sage, and fan angula'rly disposed [discharge l I a v i\;r

- lv saases erieseeamzelie h l r in atransverse direction said roof is incl ned" a iupwardly along only one side thereoLthede- I 1 v gree of said transverse inclination decreasing 1 {,{diverging in a downstream directionywhilef i in a transverse dlI'CCtlOIl'Sitld roof is inclined formed by a series of parallelradii; c 29. Adraft'tube having an entra-nceipas-i a a sa'ge,*and. an angularly disposed discharge 1 zontal plane and shaped similajrlyfto the back of said upstream w'all in a horizontal v trance passage being providedwitha'flarin section,

1 s t ""bellmouth formedo'n the basis of a surface f. I a i 21'. A draft'tube; having an entrance pas-l sage, and an angularly disposed passage olf set, withrespect thereto and provided with v a roof which in transverse section islin'clined i section said upstrearn'vvallforins substantialentrance passage thereby forming' a, draft upwardly along only one side thereof.; 27. A draft tube having an entrance pas- 'vided'with floor and roofsurfaces relatively" i diverg ngin a downstream direction, awhile v in atransverse direction said roof is inclined l inanupstreani direction. i 28.0 A draft tube having an entrance pas-R ff sage, andan angul'arly disposed passageypro- 111% 'vided with floor; and roof surfacesrelatively Q upwardly along only onejsidetliereo f,ftlie upstream wall ofsaid angular passage being ljiis passageolifsetwithrespectthereto,lsaid en; g 1 2a of revolution while said discharge passage has anupstream wall intersectinggsaidhell.-

'ly acontinuation ofthe upstream sideofs aid tube the generalelbowotyp e whereinifiuidf f flows from saidentrance passage intove d, 

